Imagine going further and further back in time. As you move back hundreds of thousands and millions of years, this tree would show more broad relationships - between not just all the people who are your ancestors, but between people and primates, mammals, and other animals. Each point where a cladogram separates into branches represents a time when 2 species shared a common ancestor.

Think you've got it? Try putting the following animals into one of the cladograms below:

FISH FAMILY TREES